Heat exchanger



July 18, 1933. G. T. AcocKs ETI' AL HEAT EXCHANGER Filed April 22, 19322 Sheets-Sheet 2 IN VEN TORS g6 ZZ/acacks m/0m 5. Horn; 7%. 2; A

ATTORNEY.

Patented July 18, 1933 UNITED STATES PATENT OFFICE GEORGE T. JACOCK S,STANLEY J. CHUTE, AND JAMES B. FORBES, 01 NEW YORK, N. Y

ASSIGNORS TO ALGO PRODUCTS, INCORPORATED, OF NEW YORK, N. Y., A CORPORA-TION OF DELAWARE HEAT EXCHANGER Application filed April 22,

Our invention relates to heat exchangers and more particularly to a highpressure, high temperature heat exchanger adapted for use in connectionwith the pyrolytic processing of hydrocarbon oils.

One object of our invention is to provide a novel construction in whichno steel castings are'used adapted to sustain high pressures and hightemperatures.

Another object of our invention is to provide a construction in whichthe minimum number of field connections must be made.

Another object of our invention is to provide a unit which is easilyaccessible for cleaning and inspection.

In the accompanying drawings which form part of the instantspecification and are to be read in conjunction therewith and in whichlike reference numerals in the various views are used to indicate likeparts;

Figure 1 is an elevation of our heat exchanger partly in section.

Figure 2 is a plan view of our heat exchanger.

Figure 3 is a sectional view partially broken away, taken on a line 3-3of Figure 2.

Figure 4 is a sectional view taken on a line 44 of Figure 3.

In general, our mvention consists in a heat exchanger having a pluralityof channel members welded to a single channel flange so as to form anintegral channel member. The liquid entrance and exit connections arecarried by the channel member. Bolted to the channel member are aplurality of shells formed in two parts, the lower portions of theshells being removable in parts without breaking the vapor connectionsfor inspection and cleaning. Each shell is provided with a separatecondensate drain and houses a tube bundle. The tubes are secured to tubesheets in the channel members at one end and at their other ends to afloating header. There is but a single floating header in each shell. Nolongitudinal baflles are used. Transverse baflles carried by the tubesare fitted.

More particularly referring now to thedrawings, channel flange 1 haswelded thereto a 1plurality of, channels 2 connected to each 0t er bypipe connections 3 which are welded 1932. Serial No. 606,852.

to the respective channel members. Each partition members givingadditional support and furnishing a means to secure the cover plates 5thereto. The cover plates 5 are also hogged out of silicon killed steeland are secured to the channel members 2 by means of short stud bolts 3and 4 which enter the part1t10n members and channels respectively. Itwill be observed that the channel members together with their coverplates form a plursi ity of stationary sub-headers. The sub headersbeing welded to a plate 1 form a composite stationary header. We preferto term the plate-1 the flange member. The stationar header assemblywill be referred to as the stationary header, while the channel membersand their cover plates will be termed sub-headers. Liquid inlet pipe 6is welded to one channel member and liquid outlet pipe 7 is welded tothe last channel mem ber. The lower portions of the channel member aremade of unusual thickness to allow for corrosion and form heavy tubesheets capable of withstanding the high pressures with whichthe heatexchanger is designed to be used. Welded to channel flange 1 are lugs 8adapted to support our heat exchanger. Bolted to channel flanged are aplurality of shells which; house the two bundles. The shells are formedin two arts, namely, upper parts 9 which haye'bolted thereto lower 10. KThe vapor inlet connection 11 an the vapor outlet connection 12 aresecured to the upper shell portions 9. The lower shell port1ons arebolted to shell portions 9 and are provided at their lower ends withcondensate drain connections 13. The lower shell portions 10 areprovided at their lower ends with vapor pass connections 14. The upperortion of adjacent shell portions 10 are oined by brackets 15 so thattwo adjoining lower shell portions are secured to each other by brackets15 and vapor pass connections 14.

arts

By reference to Figure 1, it will be obvious that if bolts 16 whichsecure the lower shell portions 10 to the upper shell portions 9 areremoved, that a pair of lower shell portions may be dropped free toexpose the tube bunciles 17 to inspection. If desired, vapor connections14 may be made removable so that individual shells may be dropped forinspection if desired. The tube bundles 17 are provided with transversebafiles 18 which are carried by the tubesand not by the shells so thatthe shells may be readily removed. No longitudinal baflles are used,each shell forming but a single vapor pass. By using this form ofconstruction, coking and carbon depositions are avoided. The tubes 19are secured to the lower portions of the channel members 2 which formupper tube sheets and are secured at the lower ends to floating headers20. Floating headers 20 comprise floatingchannel members 21 and coverplates 22. The channel members 21 are similar to the upper channelmembers 2, being hogged out of a single billet of silicon killed steel.The cover plates 22 are likewise hogged out of silicon killed steel andprovided with integral partition members 23. The arrows in the drawingsindicate the flow of the liquid and vapor through our heat exchanger.Shells 10 are fitted with lugs 24 for lifting and handling the shells10. By removing cover plates 5 the inside of the tubes may be readilyinspected.

In operation, the liquid enters liquid inlet 6 into the first liquidpass of channel member 2 and flows downwardly into the first liquid passof the floating header, thence upwardly to the second liquid pass of thechannel member, thence downwardly to the second liquid pass of thefloating header, thence upwardly to the third liquid pass of the channelmember. This liquid flow is repeated for each channel and its respectivefloating header until the liquid leaves through liquid outlet 7. Thevapors enter vapor inlet 11, flow downwardly through the first shell,thence upwardly through the second shell, thence downwardly through thethird shell, thence upwardly through the fourth shell and leave throughvapor outlet 12. Thus it is seen that there is but one vapor pass withineach shell and the direction tively light weight. Due to thefact that.

there is but a single vapor pass through each shell, no longitudinalbafiles are necessary, which decreases the tendency to the formation ofcoke and carbon deposits. The elimination of longitudinal bafiies,furthermore, makes the shell easy of removal so that the tubes may becleaned and inspected with minimum difliculty. The only high pressureconnections necessary to be made in the field are the inlet and outletchannel connections, inasmuch as the connections between the variouselements of the exchanger are made in the shop. This is true, likewise,of the vapor connections. The compactness of the complete unit and theaccessibility for cleaning are apparent. The use of integral partitionmembers renders the use of longer stay bolts unnecessary. Only shortstay bolts are used which are tapped into the integral partitionsbetween liquid passes and these are continuous with the circle studbolts which hold the channel cover on around its circumference, insuringleak proof joints. The entire unit is supported by the lugs 8 and iseasily installed.

It will be uderstood that certain features and sub-combinations are ofutility and may be employed without reference to other features andsub-combinations. This is contemplated by and is within the scope of ourclaims. It is further obvious that various changes may be made indetails within the scope of our claims without departing from I thespirit of our invention. It is, therefore,

to be understood that our invention is not to be limited to the specificdetails shown and described.

Having thus described our invention, what we claim is:

1. A high pressure, high temperature heat exchanger adapted for use inthe pyrolytic processing of hydrocarbon oils, comprising in combinationa flange member, a plurality of sub-headers integral therewith, tubebundles communicating with the respective subheaders, a floating headercommunicating with each tube bundle, separate shells surrounding eachtube bundle and removably secured to said flange member, communicatingmeans between the sub-headers, communicating means between the shells, aliquid inlet to one sub-header, a. liquid outlet from one sub-header,whereby liquid is adapted toflow, through said respective sub-headers,tube bundles and floating headers in succession, a vapor inlet to oneshell, a vapor outlet from one shell whereby vapor is adapted to flowthrough said shells in succession in heat exchange relationshipwit'hsaid liquid.

2. A high pressure heat exchanger comprising in combination a stationaryheader, a plurality of floating headers, a plurality of tube bundlesextending between the stationary header and the respective floatingheaders, a plurality of separate shells surrounding the respective tubebundles and floating headers and a. condensate drawofi connection foreach shell.

3. A high pressure heat exchanger comprising in combination a stationaryheader, having a air of stationarysub-headers, a

air of oating headers, a pair of tube undies extending between therespective stationary sub-headers and floatin headers, a pair ofseparate shells surroun in the re spective tube bundles, said shel 8being formed in two parts, a vapor inlet connection in one of the uppershell parts, a. vapor outlet connection in the other of said upper shellparts, a vapor connection between said lower shell parts and a bracketconnecting said lower shell parts whereby the lower shell parts may beremoved together for tube bundle cleaning and inspection, withoutbreaking the vapor inlet and outlet connections.

4. A heat exchanger as in claim 2 wherein said stationa header comprisesa flange plate and subeader members welded thereto, a liquid pass pipebetween said sub-header members, cover plates to; said sub-headermembers, said members being hogged out of a single billet of siliconkilled steel and having integral liquid pass partitions therein.

5. A heat excha er as in claim 2 wherein said floating hea' ers comprisemembers hogged out of single billets of silicon killed steel, integralliquid ass partitions in said members and cover p ates secured thereto.

6. A heat exchanger as in claim 2 in which the sole supporting means forthe heat exchanger comprises lugs integral with said stationary header.I

7. A heat exchanger as in claim 2 in which said shells comprise upperand lower parts, vapor inlet and outlet connections secured to saidupper parts, whereby said lower shell partsmay be removed for tube insction without breaking said vapor inlet an outlet connections.

8. A heat exchanger as in claim 2 wherein said tube bundles are providedwith transverse baflies secured thereto and unattached to the shells,whereby said shells are rendered readily removable.

9. A high pressure heat exchanger comprising in combination a.stationary header, a luralit of floating headers, a plurality of tubebun les extending between the stationary header and the respectivefloating headers, a plurality of separate shells surrounding said tubebundles and forming a single pass for thetrav'el of vapors therethroughin heat exchange relation to liquid passing through the tubes of thetube bundles, whereby said vapors are condensed in said separate shells,and condensate drawoif connections for each shell.

- GEORGE T. JACOCKS.

STANLEY J. CHUTE. JAMES B. FORBES.

